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<h1 id="custom-datetimeprovider">Custom DateTimeProvider</h1>
<p>If your Identity Provider&#39;s clock is not synchronized, the validation of the token could fail.
If the deviation is only some seconds, you can use the <code>AuthConfig.clockSkewInSec</code> setting to allow a bigger time window deviation.</p>
<p>However, you may need to adjust the base time, that is used for the token validation and make sure, that the <code>AuthConfig.clockSkewInSec</code> is still a small reasonable number, then you can implement a custom <code>DateTimeProvider</code>.</p>
<p>To do so, create a new service that derives from <code>DateTimeProvider</code>:</p>
<div><pre class="line-numbers"><code class="language-typescript">export class MyCustomDateTimeProvider extends DateTimeProvider {
  now(): number {
    // Return your custom now.
    return Date.now();
  }

  new(): Date {
    // Return your custom new Date().
    return new Date();
  }
}</code></pre></div><p>Then, override the provider via dependency injection in your application:</p>
<div><pre class="line-numbers"><code class="language-typescript">&#64;NgModule({
  imports: [
    // etc.
    OAuthModule.forRoot()
  ],
  providers: [
    { provide: DateTimeProvider, useClass: MyCustomDateTimeProvider } // &lt;- add this
  ],
  declarations: [
    AppComponent,
    // etc.
  ],
  bootstrap: [
    AppComponent
  ]
})
export class AppModule {
}</code></pre></div>
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